US10008900B2 - Rotating electric machine - Google Patents

Rotating electric machine Download PDF

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Publication number
US10008900B2
US10008900B2 US14/759,243 US201314759243A US10008900B2 US 10008900 B2 US10008900 B2 US 10008900B2 US 201314759243 A US201314759243 A US 201314759243A US 10008900 B2 US10008900 B2 US 10008900B2
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United States
Prior art keywords
connecting plate
fixing member
electric machine
rotating electric
plate structure
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US14/759,243
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English (en)
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US20150357877A1 (en
Inventor
Tomohiro Bessho
Masashi Nakamura
Keisuke MURASE
Toshiki Kuwahara
Shogo Okamoto
Masaya Inoue
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BESSHO, TOMOHIRO, Kuwahara, Toshiki, MURASE, KEISUKE, INOUE, MASAYA, NAKAMURA, MASASHI, OKAMOTO, SHOGO
Publication of US20150357877A1 publication Critical patent/US20150357877A1/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles

Definitions

  • the present invention relates to a rotating electric machine and particularly to a rotating electric machine in which as a means for electric connection with a stator, there is utilized a connecting plate that is to hold bus bars spaced a predetermined distance apart from one another by use of holders.
  • a leg-shaped portion is provided in a holder, of the connecting plate, for fixing and holding bus bars and the leg-shaped portion is fit with and fixed to the outer circumference of the rotor (e.g., refer to Patent Document 1).
  • connection board is integrally molded with the stator by use of a resin mold (e.g., refer to Patent Document 2).
  • Patent Document 1 Japanese Patent No. 5028869 (FIGS. 1 and 5)
  • Patent Document 2 Japanese Patent No. 4900215 (FIG. 2)
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2012-080602 (FIG. 2)
  • the leg-shaped portion is formed of a resin; therefore, there has been a problem that when the rotating electric machine is a high-output and heavy-weight one and is utilized under the condition that a large mechanical load (vibration or impact) is imposed on the connecting plate, the strength thereof is not satisfactory.
  • Patent Document 2 when the connection structure is fixed, the whole stator needs to be contained in a molding die; therefore, the plant becomes large-scale, and because the stator is formed of components to be assembled, it is technically difficult to appropriately seal the stator.
  • Patent Document 3 As is the case with Patent Document 1, there has been a problem that under a high-load environment, the fixing strength is unsatisfactory.
  • a rotating electric machine utilized in an electric vehicle or a hybrid electric vehicle is a small-size and high-output one.
  • a high-strength and high-rigidity fixing means is required; however, in general, in order to enlarge the fixing strength, a large-scaled method such as upsizing the fixing structure or molding is required; thus, there has been a problem that the connection structure for supplying electricity to the inside of the rotating electric machine is upsized and made heavier.
  • the present invention has been implemented in order to solve the foregoing problems; the objective thereof is to provide a small-size and easy-to-produce rotating electric machine that is provided with a high-strength and high-rigidity connection structure.
  • a rotating electric machine includes a rotor that is mounted on an outer circumference of a rotation axle and rotates along with the rotation axle; a stator that is disposed in such a way as to face the rotor and includes an iron core provided with a plurality of teeth, insulators provided on both respective ends, in the axis-line direction of the rotation axle, of the iron core, and a coil wound around the teeth through the intermediary of the insulator; a frame that is formed of a metal material and fixes and holds the stator; and a connecting plate configured with a plurality of bus bars at each of which an end of the coil and a power-supply unit are connected with each other and that are each formed of a conductive material and a holder that is formed of an insulating material and integrally fixes and holds the plurality of bus bars.
  • a fixing member that has an annular shape around the axis line of the rotation axle and is formed of a metal material is molded integrally with the connecting plate so that a connecting plate structure is configured, and the connecting plate structure is fixed to a supporting body for the stator by utilizing an annular portion of the fixing member, as an abutting face.
  • an annular portion of the fixing member is bonded to the frame and also abuts on the insulator.
  • the connecting plate and the annular fixing member of the connecting plate structure are formed integrally with each other; therefore, the connecting plate structure itself has high rigidity. Moreover, because metal-to-metal junction is made between the fixing member and the rotating electric machine, compact and high-strength bonding can readily be achieved and hence the rotating electric machine can be downsized. Accordingly, the connecting plate can be assembled in the rotating electric machine without utilizing large-scaled production facilities.
  • FIG. 1 is a cross-sectional view illustrating a rotating electric machine according to Embodiment 1 of the present invention
  • FIG. 2 is a perspective view illustrating a connecting plate structure according to Embodiment 1 of the present invention.
  • FIG. 3 is a perspective view illustrating the shape of a bus bar according to Embodiment 1 of the present invention.
  • FIG. 4 is a plan view illustrating the rotating electric machine when the cross section A in FIG. 1 is viewed from top side;
  • FIG. 5 is a partial cross-sectional view illustrating the vicinity of a junction portion taken along the cross section B in FIG. 4 ;
  • FIG. 6 is a partial cross-sectional view illustrating the vicinity of a protrusion taken along the cross section C in FIG. 4 ;
  • FIG. 7 is a cross-sectional view illustrating the part, of a rotating electric machine according to Embodiment 2 of the present invention, that is obtained by removing a housing;
  • FIG. 8 is a cross-sectional view illustrating the part, of a rotating electric machine according to Embodiment 3 of the present invention, that is obtained by removing a housing;
  • FIG. 9 is a plan view illustrating a fixing member according to Embodiment 3 of the present invention.
  • FIG. 10 is a partial cross-sectional view illustrating the fixing member taken along the cross section D in FIG. 9 .
  • FIG. 1 is a cross-sectional view illustrating a rotating electric machine according to Embodiment 1 of the present invention
  • FIG. 2 is a perspective view illustrating a connecting plate structure according to Embodiment 1
  • FIG. 3 is a perspective view illustrating the shape of a bus bar according to Embodiment 1.
  • a rotation axle 3 is pivotably mounted in a housing 1 ;
  • a rotor 2 is mounted on the outer circumference of the rotation axle 3 and rotates along with the rotation axle 3 .
  • a stator 4 is provided in the outer circumference of the rotor 2 in such a way as to face the rotor 2 .
  • the stator 4 is configured with an iron core 5 with a plurality of tooth portions at the inner circumference side thereof, an insulator 6 provided at both axis-direction ends of the tooth portion, and a coil 7 wound around the tooth portion through the intermediary of the insulator 6 ; the stator 4 is mounted inside the housing 1 through the intermediary of a metal frame 8 .
  • An after-mentioned connecting plate structure 9 which will be explained with reference to FIG. 2 , is fixed in such a way that the bottom surface thereof in the axis-line direction of the rotation axle 3 abuts on the insulator 6 , and is also fixed to the frame 8 in such a way as to abut on the inner circumference of the frame 8 .
  • the same-phase ends of the coils 7 are connected with one another by way of the connecting plate structures 9 ; the coils 7 of some phases are connected with predetermined terminals of power-supply unit 10 .
  • the connecting plate structure 9 is configured with a plurality of bus bars 11 , a connecting plate 13 including the plurality of bus bars 11 and a holder 12 that holds the plurality of bus bars 11 at respective places where they are placed so as to secure an enough insulation distance from one another and conductive components in the vicinity thereof, and a fixing member 14 that is formed of an tabular metal material and is integrally molded with the connecting plate 13 .
  • the fixing member 14 is configured with an annular portion 14 a that is bent in the plate-thickness direction so as to be formed in an annular shape; a plurality of leg portions 14 b that each protrude from one axis-direction end of the annular portion 14 a and are then bent in the radial direction and whose front ends are each integrated with the respective side faces of the connecting plates 13 , and a plurality of protruding portions 14 c provided in the annular portion 14 a.
  • the connecting plate structure 9 a plurality of openings 9 a are formed between the connecting plate 13 and the fixing member 14 , while each of the leg portions 14 b is inserted between the openings 9 a in the circumferential direction.
  • the bus bar 11 includes bus bars 114 where the respective neutral points of the coil ends 7 a (refer to after-mentioned FIG. 4 ) are connected with one another and three bus bars 111 , 112 , and 113 to which the respective coil ends 7 a of U-phase, V-phase, and W-phase are connected and that are connected with the respective corresponding points of the power-supply unit 10 .
  • a plurality of coil connection terminals 11 a for connection thereof with corresponding coil ends 7 a are provided; the bus bar annular portion 14 a connects the coil connection terminals 11 a .
  • Each of the bus bars 111 , 112 , and 113 has a power-supply terminal 11 c for connection thereof with the power-supply unit 10 .
  • FIG. 4 is a plan view illustrating the rotating electric machine when the cross section A in FIG. 1 is viewed from top side;
  • FIG. 5 is a partial cross-sectional view illustrating the vicinity of a bonding portion taken along the cross section B in FIG. 4 ;
  • FIG. 6 is a partial cross-sectional view illustrating the vicinity of a protruding portion taken along the cross section C in FIG. 4 . As illustrated in FIGS.
  • the annular portion 14 a abuts on the inner circumferential surface of the frame 8 and the protruding portion 14 c abuts on an end 8 a , in the axis direction of the rotation axle, of the frame 8 so that the connecting plate structure 9 is mounted on the frame 8 for holding the stator 4 ;
  • the connecting plate structure 9 is bonded to the frame 8 through a plurality of welding portions 15 , each of which is provided at abutting face where the annular portion 14 a and the inner circumferential surface of the frame 8 abut on each other.
  • TIG welding is utilized; however, the bonding can also be performed by another method such as MIG welding, spot welding, or the like.
  • the coil end 7 a and the coil connection terminal 11 a are connected with each other through the opening 9 a.
  • the rotating electric machine according to Embodiment 1 of the present invention, that is configured in such a manner as described above makes it possible to obtain the following superior actions and effects.
  • the connecting plate structure 9 and the fixing member 14 formed of a metal material are integrally molded with each other; therefore, high strength and rigidity can be obtained.
  • the small bonding portion 15 makes it possible to obtain high bonding strength.
  • the connecting plate structure 9 is mounted with high strength and rigidity.
  • the radial-direction positioning of the connecting plate structure 9 is performed with the inner circumferential surface of the frame 8 and the annular portion 14 a , and the axis-direction positioning thereof can be performed with the protruding portion 14 c and the end 8 a , in the axis direction of the rotation axle, of the frame 8 . Accordingly, the mounting position thereof can readily be set with a high accuracy and hence the productivity is raised.
  • the connecting plate structure 9 can be fixed without utilizing any additional component such as a screw, a resin, or the like. Moreover, it is not required to provide a place to be filled with a resin or a mounting structure such as a screw hole or the like; therefore, the bonding portion an be downsized.
  • the opening 9 a is provided, a fluid inside the rotating electric machine can circulate through the opening 9 a , and the axis-direction ends of the connecting plate 13 and the coil 7 and the axis-direction end of the iron core can widely be exposed. Furthermore, because the fixing structure does not occupy a large amount of space, the flow path of the fluid that circulates inside the rotating electric machine can be enlarged. Therefore, the stator 4 and the connecting plate 13 can effectively be cooled.
  • the leg portion 14 b of the fixing member 14 is bent and the annular portion 14 a has a cylindrical shape in which the radial-direction thickness thereof is larger than the axis-direction thickness thereof, so that a rigid cubic structure is formed. Accordingly, the strength and the rigidity of the structure can effectively be raised with less amount of materials.
  • FIG. 7 is a cross-sectional view illustrating the part, of a rotating electric machine according to Embodiment 2 of the present invention, that is obtained by removing a housing.
  • a rotating electric machine according to Embodiment 2 when the fixing member 14 is integrally molded with the connecting plate 13 , the annular portion 14 a is directly berried in the connecting plate 13 .
  • the annular portion 14 a which is a complete ring without any seam, is inserted into the connecting plate 13 ; the connecting plate stricture 9 is pressed into the inner circumferential surface of the frame 8 at the exposed face of the annular portion 14 a.
  • the connecting plate structure 9 is fixed only by being pressed into the frame 8 ; thus, the assembly process can further be facilitated.
  • the fixation can also be performed by means of shrinkage fitting.
  • FIG. 8 is a cross-sectional view illustrating the part, of a rotating electric machine according to Embodiment 3 of the present invention, that is obtained by removing a housing;
  • FIG. 9 is a plan view illustrating a fixing member according to Embodiment 3;
  • FIG. 10 is a partial cross-sectional view illustrating the fixing member taken along the cross section D in FIG. 9 .
  • the fixing member 14 is molded by spinning processing and pressing; the annular portion 14 a is formed in the shape of a ring without any seam and has bending portions 14 d along the whole circumference thereof.
  • the annular portion 14 a abuts on the outer circumferential surface of the frame 8 , and the connecting plate structure 9 is bonded to the frame 8 through a plurality of welding portions 15 provided along the abutting face.
  • the welding portion 15 is formed by means of spot welding from the side.
  • the connecting plate structure 9 When being fixed, the connecting plate structure 9 abuts on the insulator 6 in the axis direction, so that the axis-direction positioning thereof is performed; because being pressed and fixed with a constant weight when the welding is performed, the holder 12 is pressed and fixed to the insulator 6 .
  • the annular portion 14 a is a ring without any seam and the fixing member 14 has bending portions 14 d along the whole circumference thereof except for the leg portions 14 b ; therefore, further higher strength and rigidity can be obtained.
  • the present invention relates to a connection structure of a rotating electric machine to be mounted in a vehicle and is useful when applied to a small-size and high-output-required rotating electric machine for an electric automobile or a hybrid vehicle.
US14/759,243 2013-04-26 2013-04-26 Rotating electric machine Active 2034-10-23 US10008900B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/062385 WO2014174666A1 (ja) 2013-04-26 2013-04-26 回転電機

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US20150357877A1 US20150357877A1 (en) 2015-12-10
US10008900B2 true US10008900B2 (en) 2018-06-26

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US (1) US10008900B2 (ja)
JP (1) JP5901847B2 (ja)
CN (1) CN105144550B (ja)
DE (1) DE112013006985T5 (ja)
WO (1) WO2014174666A1 (ja)

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US20170373563A1 (en) * 2015-01-07 2017-12-28 Lg Innotek Co., Ltd. Motor
US11264862B2 (en) * 2018-08-07 2022-03-01 Hyundai Mobis Co., Ltd. Terminal device for drive motor of vehicle
US11411454B2 (en) * 2016-06-08 2022-08-09 Mitsubishi Electric Corporation Rotary electric machine

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DE112013006964T5 (de) * 2013-04-19 2016-01-07 Mitsubishi Electric Corporation Elektrische Drehmaschine
CN106715091B (zh) * 2014-10-27 2019-01-01 三菱电机株式会社 结合方法、结合体、旋转电机的定子以及旋转电机的定子的制造方法
KR102329944B1 (ko) * 2015-01-07 2021-11-23 엘지이노텍 주식회사 모터
CN107615623A (zh) * 2015-07-22 2018-01-19 Ｋｙｂ株式会社 汇流条单元和具备该汇流条单元的旋转电机
JP6439622B2 (ja) 2015-07-31 2018-12-19 株式会社デンソー 回転電機の固定子
DE102016208150A1 (de) * 2016-05-12 2017-11-16 Zf Friedrichshafen Ag Stator einer elektrischen Maschine mit einer Verschaltungseinrichtung für Statorspulen und elektrische Maschine mit einem derartigen Stator
JP6759967B2 (ja) * 2016-10-21 2020-09-23 トヨタ自動車株式会社 回転電機用端末モジュール
JP6724725B2 (ja) * 2016-11-01 2020-07-15 トヨタ自動車株式会社 回転電機のステータ
DE102017205532A1 (de) * 2017-03-31 2018-10-04 Robert Bosch Gmbh Stator einer elektrischen Maschine, eine elektrische Maschine, sowie Verfahren zum Herstellen einer solchen
CN111052555B (zh) 2017-09-28 2022-04-15 日本电产株式会社 马达
WO2020013078A1 (ja) * 2018-07-13 2020-01-16 日本電産株式会社 モータ及び電動パワーステアリング装置
JP7150171B2 (ja) * 2019-06-07 2022-10-07 日立Astemo株式会社 回転電機の固定子、端子台及び回転電機
CN113394586B (zh) * 2020-03-13 2023-07-25 日本电产株式会社 汇流条组件、马达、电气产品和汇流条组件的制造方法
CN115349215A (zh) * 2020-03-31 2022-11-15 日本电产株式会社 马达
WO2023190308A1 (ja) * 2022-03-30 2023-10-05 本田技研工業株式会社 回転電機、車両、およびバスリング

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US20170373563A1 (en) * 2015-01-07 2017-12-28 Lg Innotek Co., Ltd. Motor
US10727720B2 (en) * 2015-01-07 2020-07-28 Lg Innotek Co., Ltd. Motor
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Also Published As

Publication number Publication date
JP5901847B2 (ja) 2016-04-13
CN105144550B (zh) 2017-10-24
CN105144550A (zh) 2015-12-09
DE112013006985T5 (de) 2016-01-14
US20150357877A1 (en) 2015-12-10
JPWO2014174666A1 (ja) 2017-02-23
WO2014174666A1 (ja) 2014-10-30

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